Mar. 24,1923 
Summer Irrigation of Pima Cotton 
941 
Table VIII .—Number of bolls shed for each day after flowering 
Number of days 
after flowering. 
Normal irrigation. 
Medium-heavy 
irrigation. 
Heavy irrigation. 
Grand 
total. 
el¬ 
s' 
Ci- 
9- 
Ci- 
12. 
To¬ 
tal. 
Ci- 
4- 
Cl¬ 
io. 
Ci- 
13. 
To¬ 
tal. 
el¬ 
s' 
Ci- 
11. 
Ci- 
14. 
To¬ 
tal. 
1 
1 
2 
1 
1 
3 
1 
1 
1 
X 
2 
4 
1 
3 
3 
7 
IO 
4. 
s 
2 
2 
9 
5 
5 
4 
14 
8 
5 
6 
19 
42 
5. 
8 
2 
7 
17 
7 
14 
4 
25 
7 
4 
4 
15 
57 
6. 
4 
9 
10 
23 
11 
20 
6 
37 
11 
16 
11 
38 
98 
7. 
12 
8 
11 
31 
13 
8 
IS 
36 
14 
15 
18 
47 
114 
8. 
15 
7 
IO 
32 
21 
18 
13 
52 
12 
14 
12 
38 
122 
9. 
IO 
10 
18 
38 
11 
15 
6 
32 
14 
15 
11 
40 
IIO 
10. 
9 
6 
IO 
25 
15 
9 
IO 
34 
15 
14 
IO 
39 
98 
11. 
7 
8 
6 
21 
9 
13 
6 
28 
8 
IO 
13 
3i 
80 
12.. 
7 
1 
6 
14 
IO 
8 
7 
25 
12 
9 
6 
27 
66 
3 
4 
4 
11 
13 
9 
8 
30 
IS 
6 
21 
62 
14 . 
8 
S 
5 
18 
6 
6 
1 
13 
3 
5 
6 
14 
45 
I5. 
3 
2 
5 
3 
4 
7 
14 
3 
3 
7 
13 
32 
16. 
4 
I 
5 
3 
3 
6 
12 
3 
4 
1 
8 
35 
17 ... 
5 
2 
7 
2 
2 
2 
6 
3 
6 
4 
13 
26 
tR 
2 
A 
3 
IO 
2 
2 
4 
3 
3 
17 
4 
X 
5 
3 
2 
3 
8 
3 
1 
4 
17 
on 
2 
2 
4 
1 
2 
3 
I 
1 
2 
9 
OT 
3 
I 
4 
2 
1 
3 
1 
1 
I 
3 
IO 
22 . . , t . . t f . . 
I , 
I 
2 
1 
1 
2 
2 
2 
4 
8 
23 . 
2 
I 
3 
2 
1 
3 
3 
1 
1 
5 
11 
I 
1 
2 
2 
1 
3 
2 
2 
4 
9 
I 
1 
1 
1 
2 
2 
1 
5 
7 
”5 
1 
1 
X 
a 
1 
I 
2 
3 
3 
I 
2 
3 
8 
28 . 
I 
1 
1 
1 
2 
2 
X 
3 
6 
I 
2 
3 
1 
1 
2 
5 
x 
X 
2 
1 
1 
1 
1 
2 ' 
5 
No significant differences appeared in either the amount of shedding 
per day or the total for the season as a result of the varied irrigation 
treatments. A comparison of the records in Table VII, shows that the 
number per day for one treatment is not consistently larger or smaller. 
Differences are shown both between the borders that represent the same 
treatment and between the series. The total number shed for the 
season and the percentage of shedding are less in the “normal” treated 
borders, but this may not be significant in view of the small number of 
plants included in the daily shedding record. 
As can be seen by referring to Table VII, considerable variation 
occurred in the number of bolls shed from day to day throughout all 
the borders, but the amount of shedding on certain days was often 
noticeably consistent in all the borders. August 5, 12, and 14 are good 
examples of days when heavy rates of shedding occurred, while on August 
3, 15, and 20 only a few bolls were shed. These variations may be 
analogous to the regular fluctuations found in the opening of the flowers, 
which has been discussed previously, but the limited amount of material 
is not sufficient to use as a reliable basis of comparison. 
As with the data of flowering, efforts were made to correlate the 
fluctuations of shedding with temperatures and other factors, but such 
indications were not consistent enough to justify discussion. It seems 
probable that several factors must be taken into account in attempting 
to localize and determine the causes of shedding. That shedding may 
occur from 4 to 15 days after flowering or may not take place until 
several days after the abortion is induced is only one of the many diffi¬ 
culties to be met. 
